netdev - [PATCH net] net: Disable NETIF_F_HW_TLS_TX when HW

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Message-Id: <20201104102141.3489-1-tariqt@nvidia.com>
Date:   Wed,  4 Nov 2020 12:21:41 +0200
From:   Tariq Toukan <tariqt@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>,
        Moshe Shemesh <moshe@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>,
        Boris Pismenny <borisp@...dia.com>
Subject: [PATCH net] net: Disable NETIF_F_HW_TLS_TX when HW_CSUM is disabled

With NETIF_F_HW_TLS_TX packets are encrypted in HW. This cannot be
logically done when HW_CSUM offload is off.

Fixes: 2342a8512a1e ("net: Add TLS TX offload features")
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
Reviewed-by: Boris Pismenny <borisp@...dia.com>
---
 net/core/dev.c | 5 +++++
 1 file changed, 5 insertions(+)

Hi,

Please queue to -stable >= v4.18.
Thanks.

diff --git a/net/core/dev.c b/net/core/dev.c
index 82dc6b48e45f..5f72ea17d3f7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -9588,6 +9588,11 @@ static netdev_features_t netdev_fix_features(struct net_device *dev,
 		}
 	}
 
+	if ((features & NETIF_F_HW_TLS_TX) && !(features & NETIF_F_HW_CSUM)) {
+		netdev_dbg(dev, "Dropping TLS TX HW offload feature since no CSUM feature.\n");
+		features &= ~NETIF_F_HW_TLS_TX;
+	}
+
 	return features;
 }
 
-- 
2.21.0